Wednesday, June 17, 2020

PoE budget on Cisco SG Series switches

I have a question that's gone unanswered on the SG350X-48P

Consumed Power vs Actual power

I'm trying to figure out if "budgeted" power will limit the number of devices I can power up with a SG350X-48P switch.

When I "show power inline"

The consumed power is showing whats been cumulatively budgeted by each device connected on the switch.

For example, 2 x 802.3at WiFi APs - budgeting for 25.5W each, but only consuming 9.8W each.

I'm worried that as IP-Phones get added, the PoE on the switch will go "over budget" and stop powering up additional devices while the actual power usage will be less than 50% of what's available.  Make sense?

I've seen commands posted on forums that relate to the catalyst line using 'consumed power' instead of budgeted power for deciding whether to turn up another PoE port, but nothing on the SG series switches.

Output below has been edited for brevity.

show power inline
Power-limit mode: Class based
Usage threshold: 95%
Trap: Disable
Legacy Mode: Enable
Inrush Test: Enable
Class Error Detection: Enable
Unit Module Nominal Consumed Temp SW PSE chipset
Power (W) Power (W) (C) Version HW Revision
---- -------------- --------- ------------ -------- ------------- -----------------
1 SG350X-48P 375 52 (14%) 44 23.190.18.3 PD69208 - 0x4A02
~

Interface Admin Oper Power (W) Class Device Priority
---------- ---------- ----------- ----------------- ----- -------------- --------
gi1/0/1 Auto On 9.800 (25.500) 4 high
~
gi1/0/25 Auto On 9.600 (25.500) 4 high
gi1/0/26 Auto Searching 0.0 0 high
gi1/0/27 Auto Searching 0.0 0 low
gi1/0/28 Auto Searching 0.0 0 low



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